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- Join Date
- Jul 2013
Problem with multiple USB devices
I'm running MINT15 / MATE on a toshiba atom laptop. I have 2 RS232-to-USB adapters I am trying to get working while both are physically connected to the computer. The problem is that I can only seem to get one of them working if the other is disconnected, and I think this is because the OS is trying to use ttyUSB0 for both of them.
Here's some info:
A. Output of lsusb with all devices connected:
toshiba-linux ~ $ lsusb Bus 001 Device 011: ID 1a40:0101 Terminus Technology Inc. 4-Port HUB Bus 001 Device 004: ID 04f2:b15d Chicony Electronics Co., Ltd Bus 002 Device 002: ID 04e2:1410 Exar Corp. Bus 004 Device 002: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 012: ID 1443:0007 Digilent CoolRunner-II CPLD Starter Kit Bus 001 Device 015: ID 03fd:0008 Xilinx, Inc.
toshiba-linux ~ $ dmesg | grep ttyUSB0 [ 963.837493] vizzini 2-1:1.0: >ttyUSB0: XR21v14x usb uart device [ 1108.068403] sysfs: cannot create duplicate filename '/class/tty/ttyUSB0' [ 1108.069198] usb 4-1: >FTDI USB Serial Device converter now attached to ttyUSB0
1. In order to use one of the RS232-to-USB adapters, I have to run through the install instructions each time I boot, otherwise I cannot use the device. The install instructions are as follows:
* Make sure the Vizzini device is unplugged from the Linux host. * Make sure that the cdc-acm driver and any previously loaded vizzini driver modules are not loaded. # rmmod cdc_acm # rmmod vizzini # modprobe -r usbserial * Install the vizzini driver module. # modprobe usbserial # insmod ./vizzini.ko * Plug Vizzini into the host. You should see four devices created, typically /dev/ttyUSB[0-3].
2. How can I resolve the "sysfs: cannot create duplicate filename '/class/tty/ttyUSB0" conflict and get it to enumerate the USB devices sequentially so I can use all of them without disconnecting any?
Any help / suggestions would be greatly appreciated!
- Join Date
- Jan 2005
- Saint Paul, MN
The problem is that what you think is a install script is really just a script that removes at least 3 linux kernel modules and loads loads a special version of one of the drivers. In order to have this work, you will need to replace the "vizzini.ko" that is in the "/lib/modules/`uname -r`" directory tree with the one provided by the script (in both cases, you will need to find the file) as I do not have this kernel module built and can not tell you it's location and I have not idea what the location when the script is running "insmod ./vizzini.ko".